bq25710: Ensure low power mode is disabled when reading reg 0x3E
bq25710: Ensure low power mode is disabled when reading reg 0x3E

The bq25710 relies on voltage divider connected to the CELL_BATPRESZ
pin in order to set the correct value for VSYS_MIN for different
battery types (1S - 4S). The voltage divider is connected to VDDA.

This circuit is not powered when the bq25710 is in low power mode,
which is the default mode when AC is not connected. This CL ensures
that bq25710 is not in low power mode, prior to reading the value of
MinSystemVoltage (register 0x3E).

BUG=b:142087417
BRANCH=firmware-hatch-12672.B
TEST=On Kohaku, without AC power removed battery connection, then
reconnected the battery and verfied that register 0x3E had the
expected value for a 2S battery.

Change-Id: Ib008813cab15a4b4c7ee2ec7e411282e54b37d0b
Signed-off-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1993911
Tested-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@chromium.org>
Tested-by: YongBeum.Ha <0375183cfb575c7cdd5cfe73f9fcd260a8810df7@samsung.corp-partner.google.com>
Reviewed-by: Tim Wawrzynczak <86444811eee8c2cb29e29a251d7a069e64ccc665@chromium.org>
Commit-Queue: Shelley Chen <ab7b8cc85923339aed379eb1c5cc4dccfd2eb3d7@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec